Capability-based Access Control Document Improvements

[kgebreki]

Closes #1517

Description

This PR contains minor edits to the examples used in the Capability-based Access Control doc. A full description of the changes is found in the issue.

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Completed the following

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[turbolent]

Thank you for your improvements!

[codecov-commenter]

Codecov Report

Merging #1519 (4509b85) into master (5238cce) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1519      +/-   ##
==========================================
+ Coverage   74.68%   74.70%   +0.01%     
==========================================
  Files         289      289              
  Lines       55607    55618      +11     
==========================================
+ Hits        41528    41547      +19     
+ Misses      12584    12579       -5     
+ Partials     1495     1492       -3     

Flag	Coverage Δ
unittests	74.70% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
runtime/sema/simple_type.go	92.30% <0.00%> (-3.85%)	⬇️
runtime/sema/member_set.go	93.75% <0.00%> (-0.59%)	⬇️
runtime/sema/errors.go	57.29% <0.00%> (+0.08%)	⬆️
runtime/sema/type.go	88.66% <0.00%> (+0.08%)	⬆️
runtime/sema/checker.go	89.59% <0.00%> (+0.11%)	⬆️
runtime/sema/check_assignment.go	97.45% <0.00%> (+0.13%)	⬆️
runtime/sema/ordered_map_member_struct.go	49.29% <0.00%> (+7.04%)	⬆️

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